javascript - Node.js 流 'end' 事件未触发

Question

下面的数据流不会触发'end'事件。 “数据”事件被触发，我可以看到记录到控制台的每个数据行。

var AWS = require('aws-sdk');
var ogr2ogr = require('ogr2ogr');
var JSONStream = require('JSONStream');

var S3 = new AWS.S3();
var source = S3.getObject({bucket: ..., key: ...}).createReadStream();

var stream = ogr2ogr(source).format("GeoJSON").stream()
  .pipe(JSONStream.parse('features.*'));

stream.on('data', function(data){
  console.log(data);                // Correctly outputs 70 rows of data.
})

stream.on('end', function(){
     console.log('end');            // This code is never executed.
})    

stream.on('error', function(err){
     console.log(err);              // No errors...
})

如果我在 ogr2ogr 转换后创建写入 -> 读取流，则该过程有效。

Answer 1

查看文档:https://nodejs.org/api/stream.html#stream_event_end

Note that the 'end' event will not fire unless the data is completely consumed. This can be done by switching into a flowing mode, or by calling stream.read() repeatedly until you get to the end